Grids are collections of rectangular content areas ordered into rows and columns. They provide a formal way to organize design objects in a document, and are useful in print and digital formats. Webpages in particular can establish grids through Cascading Style Sheets (CSS).

Content inside of a grid applies internal pressure that helps determine the number and size of grid cells. The grid format applies external pressure to regulate the size of the whole grid. Grids require initial planning, as they must accommodate the full variety of design objects included in a document. Text size and line length vary with regard to column width and number, as well as intended use (skimming, scanning, or reading).

Negative space such as grid margins, gutters, and flow lines are crucial for establishing order.

Once a strong grid structure has been established in a document, it can be occasionally violated to create emphasis. (This is invoking contrast for rhetorical effect.)

All appropriate layout software—including Adobe InDesign, the industry standard—offers the option to create grid guides.